According to Somerville Deputy Police Chief Paul Upton, one person was stabbed and has been taken to a local hospital. He said an arrest had been made, but it is unknown if either person is a student at the school. Police said no further information is available at this time.

According to a group of Somerville High School students, three police cruisers, a fire truck and an an ambulance arrived after a brawl broke out in the parking lot next to the main entrance. The group did not, however, witness the stabbing. By 4 p.m., the scene had been cleared and all was quiet.